arch/arm/mm/init.c

   1 /*
   2  *  linux/arch/arm/mm/init.c
   3  *
   4  *  Copyright (C) 1995-2005 Russell King
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License version 2 as
   8  * published by the Free Software Foundation.
   9  */
  10 #include <linux/kernel.h>
  11 #include <linux/errno.h>
  12 #include <linux/swap.h>
  13 #include <linux/init.h>
  14 #include <linux/bootmem.h>
  15 #include <linux/mman.h>
  16 #include <linux/export.h>
  17 #include <linux/nodemask.h>
  18 #include <linux/initrd.h>
  19 #include <linux/of_fdt.h>
  20 #include <linux/highmem.h>
  21 #include <linux/gfp.h>
  22 #include <linux/memblock.h>
  23
  24 #include <asm/mach-types.h>
  25 #include <asm/memblock.h>
  26 #include <asm/prom.h>
  27 #include <asm/sections.h>
  28 #include <asm/setup.h>
  29 #include <asm/sizes.h>
  30 #include <asm/tlb.h>
  31 #include <asm/fixmap.h>
  32
  33 #include <asm/mach/arch.h>
  34 #include <asm/mach/map.h>
  35
  36 #include "mm.h"
  37
  38 static unsigned long phys_initrd_start __initdata = 0;
  39 static unsigned long phys_initrd_size __initdata = 0;
  40
  41 static int __init early_initrd(char *p)
  42 {
  43         unsigned long start, size;
  44         char *endp;
  45
  46         start = memparse(p, &endp);
  47         if (*endp == ',') {
  48                 size = memparse(endp + 1, NULL);
  49
  50                 phys_initrd_start = start;
  51                 phys_initrd_size = size;
  52         }
  53         return 0;
  54 }
  55 early_param("initrd", early_initrd);
  56
  57 static int __init parse_tag_initrd(const struct tag *tag)
  58 {
  59         printk(KERN_WARNING "ATAG_INITRD is deprecated; "
  60                 "please update your bootloader.\n");
  61         phys_initrd_start = __virt_to_phys(tag->u.initrd.start);
  62         phys_initrd_size = tag->u.initrd.size;
  63         return 0;
  64 }
  65
  66 __tagtable(ATAG_INITRD, parse_tag_initrd);
  67
  68 static int __init parse_tag_initrd2(const struct tag *tag)
  69 {
  70         phys_initrd_start = tag->u.initrd.start;
  71         phys_initrd_size = tag->u.initrd.size;
  72         return 0;
  73 }
  74
  75 __tagtable(ATAG_INITRD2, parse_tag_initrd2);
  76
  77 #ifdef CONFIG_OF_FLATTREE
  78 void __init early_init_dt_setup_initrd_arch(unsigned long start, unsigned long end)
  79 {
  80         phys_initrd_start = start;
  81         phys_initrd_size = end - start;
  82 }
  83 #endif /* CONFIG_OF_FLATTREE */
  84
  85 /*
  86  * This keeps memory configuration data used by a couple memory
  87  * initialization functions, as well as show_mem() for the skipping
  88  * of holes in the memory map.  It is populated by arm_add_memory().
  89  */
  90 struct meminfo meminfo;
  91
  92 void show_mem(unsigned int filter)
  93 {
  94         int free = 0, total = 0, reserved = 0;
  95         int shared = 0, cached = 0, slab = 0, i;
  96         struct meminfo * mi = &meminfo;
  97
  98         printk("Mem-info:\n");
  99         show_free_areas(filter);
 100
 101         for_each_bank (i, mi) {
 102                 struct membank *bank = &mi->bank[i];
 103                 unsigned int pfn1, pfn2;
 104                 struct page *page, *end;
 105
 106                 pfn1 = bank_pfn_start(bank);
 107                 pfn2 = bank_pfn_end(bank);
 108
 109                 page = pfn_to_page(pfn1);
 110                 end  = pfn_to_page(pfn2 - 1) + 1;
 111
 112                 do {
 113                         total++;
 114                         if (PageReserved(page))
 115                                 reserved++;
 116                         else if (PageSwapCache(page))
 117                                 cached++;
 118                         else if (PageSlab(page))
 119                                 slab++;
 120                         else if (!page_count(page))
 121                                 free++;
 122                         else
 123                                 shared += page_count(page) - 1;
 124                         page++;
 125                 } while (page < end);
 126         }
 127
 128         printk("%d pages of RAM\n", total);
 129         printk("%d free pages\n", free);
 130         printk("%d reserved pages\n", reserved);
 131         printk("%d slab pages\n", slab);
 132         printk("%d pages shared\n", shared);
 133         printk("%d pages swap cached\n", cached);
 134 }
 135
 136 static void __init find_limits(unsigned long *min, unsigned long *max_low,
 137                                unsigned long *max_high)
 138 {
 139         struct meminfo *mi = &meminfo;
 140         int i;
 141
 142         /* This assumes the meminfo array is properly sorted */
 143         *min = bank_pfn_start(&mi->bank[0]);
 144         for_each_bank (i, mi)
 145                 if (mi->bank[i].highmem)
 146                                 break;
 147         *max_low = bank_pfn_end(&mi->bank[i - 1]);
 148         *max_high = bank_pfn_end(&mi->bank[mi->nr_banks - 1]);
 149 }
 150
 151 static void __init arm_bootmem_init(unsigned long start_pfn,
 152         unsigned long end_pfn)
 153 {
 154         struct memblock_region *reg;
 155         unsigned int boot_pages;
 156         phys_addr_t bitmap;
 157         pg_data_t *pgdat;
 158
 159         /*
 160          * Allocate the bootmem bitmap page.  This must be in a region
 161          * of memory which has already been mapped.
 162          */
 163         boot_pages = bootmem_bootmap_pages(end_pfn - start_pfn);
 164         bitmap = memblock_alloc_base(boot_pages << PAGE_SHIFT, L1_CACHE_BYTES,
 165                                 __pfn_to_phys(end_pfn));
 166
 167         /*
 168          * Initialise the bootmem allocator, handing the
 169          * memory banks over to bootmem.
 170          */
 171         node_set_online(0);
 172         pgdat = NODE_DATA(0);
 173         init_bootmem_node(pgdat, __phys_to_pfn(bitmap), start_pfn, end_pfn);
 174
 175         /* Free the lowmem regions from memblock into bootmem. */
 176         for_each_memblock(memory, reg) {
 177                 unsigned long start = memblock_region_memory_base_pfn(reg);
 178                 unsigned long end = memblock_region_memory_end_pfn(reg);
 179
 180                 if (end >= end_pfn)
 181                         end = end_pfn;
 182                 if (start >= end)
 183                         break;
 184
 185                 free_bootmem(__pfn_to_phys(start), (end - start) << PAGE_SHIFT);
 186         }
 187
 188         /* Reserve the lowmem memblock reserved regions in bootmem. */
 189         for_each_memblock(reserved, reg) {
 190                 unsigned long start = memblock_region_reserved_base_pfn(reg);
 191                 unsigned long end = memblock_region_reserved_end_pfn(reg);
 192
 193                 if (end >= end_pfn)
 194                         end = end_pfn;
 195                 if (start >= end)
 196                         break;
 197
 198                 reserve_bootmem(__pfn_to_phys(start),
 199                                 (end - start) << PAGE_SHIFT, BOOTMEM_DEFAULT);
 200         }
 201 }
 202
 203 #ifdef CONFIG_ZONE_DMA
 204
 205 unsigned long arm_dma_zone_size __read_mostly;
 206 EXPORT_SYMBOL(arm_dma_zone_size);
 207
 208 /*
 209  * The DMA mask corresponding to the maximum bus address allocatable
 210  * using GFP_DMA.  The default here places no restriction on DMA
 211  * allocations.  This must be the smallest DMA mask in the system,
 212  * so a successful GFP_DMA allocation will always satisfy this.
 213  */
 214 u32 arm_dma_limit;
 215
 216 static void __init arm_adjust_dma_zone(unsigned long *size, unsigned long *hole,
 217         unsigned long dma_size)
 218 {
 219         if (size[0] <= dma_size)
 220                 return;
 221
 222         size[ZONE_NORMAL] = size[0] - dma_size;
 223         size[ZONE_DMA] = dma_size;
 224         hole[ZONE_NORMAL] = hole[0];
 225         hole[ZONE_DMA] = 0;
 226 }
 227 #endif
 228
 229 static void __init arm_bootmem_free(unsigned long min, unsigned long max_low,
 230         unsigned long max_high)
 231 {
 232         unsigned long zone_size[MAX_NR_ZONES], zhole_size[MAX_NR_ZONES];
 233         struct memblock_region *reg;
 234
 235         /*
 236          * initialise the zones.
 237          */
 238         memset(zone_size, 0, sizeof(zone_size));
 239
 240         /*
 241          * The memory size has already been determined.  If we need
 242          * to do anything fancy with the allocation of this memory
 243          * to the zones, now is the time to do it.
 244          */
 245         zone_size[0] = max_low - min;
 246 #ifdef CONFIG_HIGHMEM
 247         zone_size[ZONE_HIGHMEM] = max_high - max_low;
 248 #endif
 249
 250         /*
 251          * Calculate the size of the holes.
 252          *  holes = node_size - sum(bank_sizes)
 253          */
 254         memcpy(zhole_size, zone_size, sizeof(zhole_size));
 255         for_each_memblock(memory, reg) {
 256                 unsigned long start = memblock_region_memory_base_pfn(reg);
 257                 unsigned long end = memblock_region_memory_end_pfn(reg);
 258
 259                 if (start < max_low) {
 260                         unsigned long low_end = min(end, max_low);
 261                         zhole_size[0] -= low_end - start;
 262                 }
 263 #ifdef CONFIG_HIGHMEM
 264                 if (end > max_low) {
 265                         unsigned long high_start = max(start, max_low);
 266                         zhole_size[ZONE_HIGHMEM] -= end - high_start;
 267                 }
 268 #endif
 269         }
 270
 271 #ifdef CONFIG_ZONE_DMA
 272         /*
 273          * Adjust the sizes according to any special requirements for
 274          * this machine type.
 275          */
 276         if (arm_dma_zone_size) {
 277                 arm_adjust_dma_zone(zone_size, zhole_size,
 278                         arm_dma_zone_size >> PAGE_SHIFT);
 279                 arm_dma_limit = PHYS_OFFSET + arm_dma_zone_size - 1;
 280         } else
 281                 arm_dma_limit = 0xffffffff;
 282 #endif
 283
 284         free_area_init_node(0, zone_size, min, zhole_size);
 285 }
 286
 287 #ifdef CONFIG_HAVE_ARCH_PFN_VALID
 288 int pfn_valid(unsigned long pfn)
 289 {
 290         return memblock_is_memory(__pfn_to_phys(pfn));
 291 }
 292 EXPORT_SYMBOL(pfn_valid);
 293 #endif
 294
 295 #ifndef CONFIG_SPARSEMEM
 296 static void arm_memory_present(void)
 297 {
 298 }
 299 #else
 300 static void arm_memory_present(void)
 301 {
 302         struct memblock_region *reg;
 303
 304         for_each_memblock(memory, reg)
 305                 memory_present(0, memblock_region_memory_base_pfn(reg),
 306                                memblock_region_memory_end_pfn(reg));
 307 }
 308 #endif
 309
 310 static bool arm_memblock_steal_permitted = true;
 311
 312 phys_addr_t __init arm_memblock_steal(phys_addr_t size, phys_addr_t align)
 313 {
 314         phys_addr_t phys;
 315
 316         BUG_ON(!arm_memblock_steal_permitted);
 317
 318         phys = memblock_alloc(size, align);
 319         memblock_free(phys, size);
 320         memblock_remove(phys, size);
 321
 322         return phys;
 323 }
 324
 325 void __init arm_memblock_init(struct meminfo *mi, struct machine_desc *mdesc)
 326 {
 327         int i;
 328
 329         for (i = 0; i < mi->nr_banks; i++)
 330                 memblock_add(mi->bank[i].start, mi->bank[i].size);
 331
 332         /* Register the kernel text, kernel data and initrd with memblock. */
 333 #ifdef CONFIG_XIP_KERNEL
 334         memblock_reserve(__pa(_sdata), _end - _sdata);
 335 #else
 336         memblock_reserve(__pa(_stext), _end - _stext);
 337 #endif
 338 #ifdef CONFIG_BLK_DEV_INITRD
 339         if (phys_initrd_size &&
 340             !memblock_is_region_memory(phys_initrd_start, phys_initrd_size)) {
 341                 pr_err("INITRD: 0x%08lx+0x%08lx is not a memory region - disabling initrd\n",
 342                        phys_initrd_start, phys_initrd_size);
 343                 phys_initrd_start = phys_initrd_size = 0;
 344         }
 345         if (phys_initrd_size &&
 346             memblock_is_region_reserved(phys_initrd_start, phys_initrd_size)) {
 347                 pr_err("INITRD: 0x%08lx+0x%08lx overlaps in-use memory region - disabling initrd\n",
 348                        phys_initrd_start, phys_initrd_size);
 349                 phys_initrd_start = phys_initrd_size = 0;
 350         }
 351         if (phys_initrd_size) {
 352                 memblock_reserve(phys_initrd_start, phys_initrd_size);
 353
 354                 /* Now convert initrd to virtual addresses */
 355                 initrd_start = __phys_to_virt(phys_initrd_start);
 356                 initrd_end = initrd_start + phys_initrd_size;
 357         }
 358 #endif
 359
 360         arm_mm_memblock_reserve();
 361         arm_dt_memblock_reserve();
 362
 363         /* reserve any platform specific memblock areas */
 364         if (mdesc->reserve)
 365                 mdesc->reserve();
 366
 367         arm_memblock_steal_permitted = false;
 368         memblock_allow_resize();
 369         memblock_dump_all();
 370 }
 371
 372 void __init bootmem_init(void)
 373 {
 374         unsigned long min, max_low, max_high;
 375
 376         max_low = max_high = 0;
 377
 378         find_limits(&min, &max_low, &max_high);
 379
 380         arm_bootmem_init(min, max_low);
 381
 382         /*
 383          * Sparsemem tries to allocate bootmem in memory_present(),
 384          * so must be done after the fixed reservations
 385          */
 386         arm_memory_present();
 387
 388         /*
 389          * sparse_init() needs the bootmem allocator up and running.
 390          */
 391         sparse_init();
 392
 393         /*
 394          * Now free the memory - free_area_init_node needs
 395          * the sparse mem_map arrays initialized by sparse_init()
 396          * for memmap_init_zone(), otherwise all PFNs are invalid.
 397          */
 398         arm_bootmem_free(min, max_low, max_high);
 399
 400         /*
 401          * This doesn't seem to be used by the Linux memory manager any
 402          * more, but is used by ll_rw_block.  If we can get rid of it, we
 403          * also get rid of some of the stuff above as well.
 404          *
 405          * Note: max_low_pfn and max_pfn reflect the number of _pages_ in
 406          * the system, not the maximum PFN.
 407          */
 408         max_low_pfn = max_low - PHYS_PFN_OFFSET;
 409         max_pfn = max_high - PHYS_PFN_OFFSET;
 410 }
 411
 412 static inline int free_area(unsigned long pfn, unsigned long end, char *s)
 413 {
 414         unsigned int pages = 0, size = (end - pfn) << (PAGE_SHIFT - 10);
 415
 416         for (; pfn < end; pfn++) {
 417                 struct page *page = pfn_to_page(pfn);
 418                 ClearPageReserved(page);
 419                 init_page_count(page);
 420                 __free_page(page);
 421                 pages++;
 422         }
 423
 424         if (size && s)
 425                 printk(KERN_INFO "Freeing %s memory: %dK\n", s, size);
 426
 427         return pages;
 428 }
 429
 430 /*
 431  * Poison init memory with an undefined instruction (ARM) or a branch to an
 432  * undefined instruction (Thumb).
 433  */
 434 static inline void poison_init_mem(void *s, size_t count)
 435 {
 436         u32 *p = (u32 *)s;
 437         for (; count != 0; count -= 4)
 438                 *p++ = 0xe7fddef0;
 439 }
 440
 441 static inline void
 442 free_memmap(unsigned long start_pfn, unsigned long end_pfn)
 443 {
 444         struct page *start_pg, *end_pg;
 445         unsigned long pg, pgend;
 446
 447         /*
 448          * Convert start_pfn/end_pfn to a struct page pointer.
 449          */
 450         start_pg = pfn_to_page(start_pfn - 1) + 1;
 451         end_pg = pfn_to_page(end_pfn - 1) + 1;
 452
 453         /*
 454          * Convert to physical addresses, and
 455          * round start upwards and end downwards.
 456          */
 457         pg = (unsigned long)PAGE_ALIGN(__pa(start_pg));
 458         pgend = (unsigned long)__pa(end_pg) & PAGE_MASK;
 459
 460         /*
 461          * If there are free pages between these,
 462          * free the section of the memmap array.
 463          */
 464         if (pg < pgend)
 465                 free_bootmem(pg, pgend - pg);
 466 }
 467
 468 /*
 469  * The mem_map array can get very big.  Free the unused area of the memory map.
 470  */
 471 static void __init free_unused_memmap(struct meminfo *mi)
 472 {
 473         unsigned long bank_start, prev_bank_end = 0;
 474         unsigned int i;
 475
 476         /*
 477          * This relies on each bank being in address order.
 478          * The banks are sorted previously in bootmem_init().
 479          */
 480         for_each_bank(i, mi) {
 481                 struct membank *bank = &mi->bank[i];
 482
 483                 bank_start = bank_pfn_start(bank);
 484
 485 #ifdef CONFIG_SPARSEMEM
 486                 /*
 487                  * Take care not to free memmap entries that don't exist
 488                  * due to SPARSEMEM sections which aren't present.
 489                  */
 490                 bank_start = min(bank_start,
 491                                  ALIGN(prev_bank_end, PAGES_PER_SECTION));
 492 #else
 493                 /*
 494                  * Align down here since the VM subsystem insists that the
 495                  * memmap entries are valid from the bank start aligned to
 496                  * MAX_ORDER_NR_PAGES.
 497                  */
 498                 bank_start = round_down(bank_start, MAX_ORDER_NR_PAGES);
 499 #endif
 500                 /*
 501                  * If we had a previous bank, and there is a space
 502                  * between the current bank and the previous, free it.
 503                  */
 504                 if (prev_bank_end && prev_bank_end < bank_start)
 505                         free_memmap(prev_bank_end, bank_start);
 506
 507                 /*
 508                  * Align up here since the VM subsystem insists that the
 509                  * memmap entries are valid from the bank end aligned to
 510                  * MAX_ORDER_NR_PAGES.
 511                  */
 512                 prev_bank_end = ALIGN(bank_pfn_end(bank), MAX_ORDER_NR_PAGES);
 513         }
 514
 515 #ifdef CONFIG_SPARSEMEM
 516         if (!IS_ALIGNED(prev_bank_end, PAGES_PER_SECTION))
 517                 free_memmap(prev_bank_end,
 518                             ALIGN(prev_bank_end, PAGES_PER_SECTION));
 519 #endif
 520 }
 521
 522 static void __init free_highpages(void)
 523 {
 524 #ifdef CONFIG_HIGHMEM
 525         unsigned long max_low = max_low_pfn + PHYS_PFN_OFFSET;
 526         struct memblock_region *mem, *res;
 527
 528         /* set highmem page free */
 529         for_each_memblock(memory, mem) {
 530                 unsigned long start = memblock_region_memory_base_pfn(mem);
 531                 unsigned long end = memblock_region_memory_end_pfn(mem);
 532
 533                 /* Ignore complete lowmem entries */
 534                 if (end <= max_low)
 535                         continue;
 536
 537                 /* Truncate partial highmem entries */
 538                 if (start < max_low)
 539                         start = max_low;
 540
 541                 /* Find and exclude any reserved regions */
 542                 for_each_memblock(reserved, res) {
 543                         unsigned long res_start, res_end;
 544
 545                         res_start = memblock_region_reserved_base_pfn(res);
 546                         res_end = memblock_region_reserved_end_pfn(res);
 547
 548                         if (res_end < start)
 549                                 continue;
 550                         if (res_start < start)
 551                                 res_start = start;
 552                         if (res_start > end)
 553                                 res_start = end;
 554                         if (res_end > end)
 555                                 res_end = end;
 556                         if (res_start != start)
 557                                 totalhigh_pages += free_area(start, res_start,
 558                                                              NULL);
 559                         start = res_end;
 560                         if (start == end)
 561                                 break;
 562                 }
 563
 564                 /* And now free anything which remains */
 565                 if (start < end)
 566                         totalhigh_pages += free_area(start, end, NULL);
 567         }
 568         totalram_pages += totalhigh_pages;
 569 #endif
 570 }
 571
 572 /*
 573  * mem_init() marks the free areas in the mem_map and tells us how much
 574  * memory is free.  This is done after various parts of the system have
 575  * claimed their memory after the kernel image.
 576  */
 577 void __init mem_init(void)
 578 {
 579         unsigned long reserved_pages, free_pages;
 580         struct memblock_region *reg;
 581         int i;
 582 #ifdef CONFIG_HAVE_TCM
 583         /* These pointers are filled in on TCM detection */
 584         extern u32 dtcm_end;
 585         extern u32 itcm_end;
 586 #endif
 587
 588         max_mapnr   = pfn_to_page(max_pfn + PHYS_PFN_OFFSET) - mem_map;
 589
 590         /* this will put all unused low memory onto the freelists */
 591         free_unused_memmap(&meminfo);
 592
 593         totalram_pages += free_all_bootmem();
 594
 595 #ifdef CONFIG_SA1111
 596         /* now that our DMA memory is actually so designated, we can free it */
 597         totalram_pages += free_area(PHYS_PFN_OFFSET,
 598                                     __phys_to_pfn(__pa(swapper_pg_dir)), NULL);
 599 #endif
 600
 601         free_highpages();
 602
 603         reserved_pages = free_pages = 0;
 604
 605         for_each_bank(i, &meminfo) {
 606                 struct membank *bank = &meminfo.bank[i];
 607                 unsigned int pfn1, pfn2;
 608                 struct page *page, *end;
 609
 610                 pfn1 = bank_pfn_start(bank);
 611                 pfn2 = bank_pfn_end(bank);
 612
 613                 page = pfn_to_page(pfn1);
 614                 end  = pfn_to_page(pfn2 - 1) + 1;
 615
 616                 do {
 617                         if (PageReserved(page))
 618                                 reserved_pages++;
 619                         else if (!page_count(page))
 620                                 free_pages++;
 621                         page++;
 622                 } while (page < end);
 623         }
 624
 625         /*
 626          * Since our memory may not be contiguous, calculate the
 627          * real number of pages we have in this system
 628          */
 629         printk(KERN_INFO "Memory:");
 630         num_physpages = 0;
 631         for_each_memblock(memory, reg) {
 632                 unsigned long pages = memblock_region_memory_end_pfn(reg) -
 633                         memblock_region_memory_base_pfn(reg);
 634                 num_physpages += pages;
 635                 printk(" %ldMB", pages >> (20 - PAGE_SHIFT));
 636         }
 637         printk(" = %luMB total\n", num_physpages >> (20 - PAGE_SHIFT));
 638
 639         printk(KERN_NOTICE "Memory: %luk/%luk available, %luk reserved, %luK highmem\n",
 640                 nr_free_pages() << (PAGE_SHIFT-10),
 641                 free_pages << (PAGE_SHIFT-10),
 642                 reserved_pages << (PAGE_SHIFT-10),
 643                 totalhigh_pages << (PAGE_SHIFT-10));
 644
 645 #define MLK(b, t) b, t, ((t) - (b)) >> 10
 646 #define MLM(b, t) b, t, ((t) - (b)) >> 20
 647 #define MLK_ROUNDUP(b, t) b, t, DIV_ROUND_UP(((t) - (b)), SZ_1K)
 648
 649         printk(KERN_NOTICE "Virtual kernel memory layout:\n"
 650                         "    vector  : 0x%08lx - 0x%08lx   (%4ld kB)\n"
 651 #ifdef CONFIG_HAVE_TCM
 652                         "    DTCM    : 0x%08lx - 0x%08lx   (%4ld kB)\n"
 653                         "    ITCM    : 0x%08lx - 0x%08lx   (%4ld kB)\n"
 654 #endif
 655                         "    fixmap  : 0x%08lx - 0x%08lx   (%4ld kB)\n"
 656                         "    vmalloc : 0x%08lx - 0x%08lx   (%4ld MB)\n"
 657                         "    lowmem  : 0x%08lx - 0x%08lx   (%4ld MB)\n"
 658 #ifdef CONFIG_HIGHMEM
 659                         "    pkmap   : 0x%08lx - 0x%08lx   (%4ld MB)\n"
 660 #endif
 661 #ifdef CONFIG_MODULES
 662                         "    modules : 0x%08lx - 0x%08lx   (%4ld MB)\n"
 663 #endif
 664                         "      .text : 0x%p" " - 0x%p" "   (%4d kB)\n"
 665                         "      .init : 0x%p" " - 0x%p" "   (%4d kB)\n"
 666                         "      .data : 0x%p" " - 0x%p" "   (%4d kB)\n"
 667                         "       .bss : 0x%p" " - 0x%p" "   (%4d kB)\n",
 668
 669                         MLK(UL(CONFIG_VECTORS_BASE), UL(CONFIG_VECTORS_BASE) +
 670                                 (PAGE_SIZE)),
 671 #ifdef CONFIG_HAVE_TCM
 672                         MLK(DTCM_OFFSET, (unsigned long) dtcm_end),
 673                         MLK(ITCM_OFFSET, (unsigned long) itcm_end),
 674 #endif
 675                         MLK(FIXADDR_START, FIXADDR_TOP),
 676                         MLM(VMALLOC_START, VMALLOC_END),
 677                         MLM(PAGE_OFFSET, (unsigned long)high_memory),
 678 #ifdef CONFIG_HIGHMEM
 679                         MLM(PKMAP_BASE, (PKMAP_BASE) + (LAST_PKMAP) *
 680                                 (PAGE_SIZE)),
 681 #endif
 682 #ifdef CONFIG_MODULES
 683                         MLM(MODULES_VADDR, MODULES_END),
 684 #endif
 685
 686                         MLK_ROUNDUP(_text, _etext),
 687                         MLK_ROUNDUP(__init_begin, __init_end),
 688                         MLK_ROUNDUP(_sdata, _edata),
 689                         MLK_ROUNDUP(__bss_start, __bss_stop));
 690
 691 #undef MLK
 692 #undef MLM
 693 #undef MLK_ROUNDUP
 694
 695         /*
 696          * Check boundaries twice: Some fundamental inconsistencies can
 697          * be detected at build time already.
 698          */
 699 #ifdef CONFIG_MMU
 700         BUILD_BUG_ON(TASK_SIZE                          > MODULES_VADDR);
 701         BUG_ON(TASK_SIZE                                > MODULES_VADDR);
 702 #endif
 703
 704 #ifdef CONFIG_HIGHMEM
 705         BUILD_BUG_ON(PKMAP_BASE + LAST_PKMAP * PAGE_SIZE > PAGE_OFFSET);
 706         BUG_ON(PKMAP_BASE + LAST_PKMAP * PAGE_SIZE      > PAGE_OFFSET);
 707 #endif
 708
 709         if (PAGE_SIZE >= 16384 && num_physpages <= 128) {
 710                 extern int sysctl_overcommit_memory;
 711                 /*
 712                  * On a machine this small we won't get
 713                  * anywhere without overcommit, so turn
 714                  * it on by default.
 715                  */
 716                 sysctl_overcommit_memory = OVERCOMMIT_ALWAYS;
 717         }
 718 }
 719
 720 void free_initmem(void)
 721 {
 722 #ifdef CONFIG_HAVE_TCM
 723         extern char __tcm_start, __tcm_end;
 724
 725         poison_init_mem(&__tcm_start, &__tcm_end - &__tcm_start);
 726         totalram_pages += free_area(__phys_to_pfn(__pa(&__tcm_start)),
 727                                     __phys_to_pfn(__pa(&__tcm_end)),
 728                                     "TCM link");
 729 #endif
 730
 731         poison_init_mem(__init_begin, __init_end - __init_begin);
 732         if (!machine_is_integrator() && !machine_is_cintegrator())
 733                 totalram_pages += free_area(__phys_to_pfn(__pa(__init_begin)),
 734                                             __phys_to_pfn(__pa(__init_end)),
 735                                             "init");
 736 }
 737
 738 #ifdef CONFIG_BLK_DEV_INITRD
 739
 740 static int keep_initrd;
 741
 742 void free_initrd_mem(unsigned long start, unsigned long end)
 743 {
 744         if (!keep_initrd) {
 745                 poison_init_mem((void *)start, PAGE_ALIGN(end) - start);
 746                 totalram_pages += free_area(__phys_to_pfn(__pa(start)),
 747                                             __phys_to_pfn(__pa(end)),
 748                                             "initrd");
 749         }
 750 }
 751
 752 static int __init keepinitrd_setup(char *__unused)
 753 {
 754         keep_initrd = 1;
 755         return 1;
 756 }
 757
 758 __setup("keepinitrd", keepinitrd_setup);
 759 #endif